Your comment is a mix of bullshit and speculation.
First, it is not marketshare that creates a monopoly, it's leverage. And Apple has hardly any leverage over the mobile phone, or smartphone, or even portable music player markets. Hell, they don't even have leverage over the online music distribution market - their competitors got to sell DRM-free higher bitrate music for almost a year before all music labels agreed to let Apple do it, and only after Apple conceded flat pricing. So, yeah I'd love to see how would regulators argue that Apple constitutes a monopoly.
As for the latter part of your comment, I've already demonstrated that, not only is your claim that content owners may not allow or hinder competitors to iTunes a completely baseless speculation, but in reality the situation is probably exactly the opposite - music labels are scared shitless by iTunes' huge popularity and are willing to give its competitors much more leeway in an attempt to get marketshare back from Apple.
At the end of it all, Apple are in no way preventing anyone form creating an alternative to their iTMS/iTunes/iPod/iPhone package - either by creating their own music distribution service and their own jukebox/library software, OR by partnering with companies that have ALREADY created such services and software.
Yeah, there is no quick, easy and free way for Palm to create the same great user experience as Apple, but Apple didn't get either to where they are quickly, easily or for free.